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Non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery including the same

a lithium secondary battery and non-aqueous electrolyte technology, which is applied in the direction of non-aqueous electrolyte cells, cell components, electrochemical generators, etc., can solve the problems of swelling phenomenon, accelerated desorption of transition metal constituting active material, and generation of electrolyte solution, etc., to achieve excellent effect on restraining swelling phenomenon of battery

Active Publication Date: 2016-10-25
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011]An aspect of the present invention is solving technical objects and providing a non-aqueous electrolyte solution for a lithium secondary battery restraining the swelling phenomenon of the battery and improving a charging / discharging cycle lifetime, and a lithium secondary battery including the same.
[0016]The non-aqueous electrolyte solution according to the present invention has an excellent effect on restraining the swelling phenomenon of a battery. Particularly, the swelling phenomenon possibly generated when storing the battery at a high temperature may be solved by using a non-aqueous electrolyte solution including a dinitrile compound having an ether bond. The swelling phenomenon possibly generated while repeatedly charging / discharging at a high temperature may be solved by adding an aliphatic dinitrile compound such as succinonitrile in the non-aqueous electrolyte solution.

Problems solved by technology

In this case, the desorption of the transition metal constituting the active material may be accelerated to induce structural instability.
However, when storing these organic solvents at a high temperature for a long time, the electrolyte solution may be oxidized to generate a gas.
Then, a swelling phenomenon may be generated to deteriorate the battery.
In severe cases, the battery may ignite or be exploded.

Method used

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  • Non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery including the same
  • Non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery including the same
  • Non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery including the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Non-Aqueous Electrolyte Solution

[0056]Into a mixture solvent including an organic solvent of ethylene carbonate (EC):propylene carbonate (PC):diethyl carbonate (DEC)=3:2:5 by weight and 1.0 M of LiPF6, 2% by weight of vinylene carbonate (VC), 3% by weight of 1,3-propanesultone (PS) and 3% by weight of fluoroethylene carbonate (FEC) based on the total amount of the electrolyte solution were added. Into the mixture solution, 1.5% by weight of ethylene glycol bis(2-cyanoethyl)ether (EGPN) and 5% by weight of succinonitrile were added to prepare a non-aqueous electrolyte solution.

[Manufacture of Lithium Secondary Battery]

[0057]LiCoO2 as a cathode active material, polyvinylidene fluoride (PVdF) as a binder and carbon as a conductive material were mixed by a mixing ratio of 93:4:4 by weight. The mixture was dispersed in N-methyl-2-pyrrolidone to prepare a cathode slurry. The slurry was coated on an aluminum foil having a thickness of 15 μm, dried and rolled to manufacture a...

example 2

[0060]A non-aqueous electrolyte solution and a lithium secondary battery were manufactured by conducting the same procedure described in Example 1 except for adding 3% by weight of ethylene glycol bis(2-cyanoethyl)ether.

experiment 1

Test on Measuring Swelling on Storing at High Temperature

[0064]In order to evaluate the swelling of each battery according to Examples 1 and 2 and Comparative Examples 1 to 3 when storing at a high temperature, each of the batteries was stored in a 4.4 V over-charged state at 60° C. for 13 days. Then, the thickness change of each of the batteries was measured. The results on the swelling test were obtained as a maximum thickness change (Δt) with respect to an initial thickness for each battery and are illustrated in following Table 1.

[0065]

TABLE 1Δt (mm)Example 13.220Example 23.094Comparative Example 13.100Comparative Example 23.089Comparative Example 34.987

[0066]As known from Table 1, the thickness change of the battery using the non-aqueous electrolyte solution excluding ethylene glycol bis(2-cyanoethyl)ether according to Comparative Example 3 is found large when comparing with those of the batteries using the non-aqueous electrolyte solutions including ethylene glycol bis(2-cyano...

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Abstract

A non-aqueous electrolyte solution for a lithium secondary battery and a lithium secondary battery including the same are provided. The non-aqueous electrolyte solution includes an organic solvent, an ionizable lithium salt, a dinitrile compound including an ether bond represented by Chemical Formula 1, and an aliphatic dinitrile compound represented by Chemical Formula 2. The lithium secondary battery including the non-aqueous electrolyte solution having the possibility of generating a swelling phenomenon while storing or charging / discharging at a high temperature may be restrained. In addition, a cycle life of the charging / discharging may be improved.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application is a continuation of International Application No. PCT / KR2013 / 000726 filed on Jan. 30, 2013, which claims priority to Korean Patent Application No. 10-2012-0048652, filed on May 8, 2012 in the Republic of Korea, the disclosures of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a non-aqueous electrolyte solution for a lithium secondary battery having the possibility of generating a swelling phenomenon after storing for a long time and conducting a charging / discharging cycle at a high temperature may be effectively restrained, and a lithium secondary battery including the same.[0004]2. Description of the Related Art[0005]Recently, interest on an energy storage technique has been gradually increased. According to the enlargement on an application field of the energy storage technique including a cellular phone, a camcorder, a ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/056H01M10/0568H01M10/052H01M4/505H01M4/525
CPCH01M10/0567H01M10/052H01M10/056H01M10/0568H01M10/0569H01M4/505H01M4/525H01M2300/004H01M2300/0034H01M2300/0037Y02E60/122Y02T10/7011H01M4/62Y02E60/10Y02T10/70
Inventor SHIM, YOU JINOH, JAE SEUNGHONG, YEON SUKLEE, BYOUNG BAELEE, HYO JIN
Owner LG ENERGY SOLUTION LTD
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